<!DOCTYPE html>
<html lang="en">
<head>
    <title></title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src='https://www.recaptcha.net/recaptcha/api.js'></script>
</head>
<body>

<form action="/check" method="post">
     <!-- 公钥 -->
    <div class="g-recaptcha" data-sitekey="6LemoXcUAAAAAGiO62U05KHImUDXw2GhsBLtjZu4"></div>
    <p><button class="btn btn-primary" type="submit">Register</button>
</form>
</body>
</html>